Borrowings (Schedule Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 26, 2014		Jul. 27, 2013
Debt Instrument [Line Items]
Total	$ 20,754		$ 16,021
Unaccreted discount	(63)		(65)
Hedge accounting fair value adjustments	210		245
Total	20,901		16,201
Current portion of long-term debt	500		3,273
Long-term debt	20,401		12,928
Floating-Rate Notes 3-month Libor Plus 0.25% Due March 2014
Debt Instrument [Line Items]
Maturity Date			Mar. 14, 2014
Notes	0		1,250
Effective Rate	0.00%		0.62%
Debt Instrument, Basis Spread on Variable Rate			0.25%
Floating Rate Notes 3-month Libor Plus 0.05% Due September 2015 [Member]
Debt Instrument [Line Items]
Maturity Date	Sep. 03, 2015
Notes	850	[1]	0
Effective Rate	0.35%		0.00%
Debt Instrument, Basis Spread on Variable Rate	0.05%
Floating Rate Notes 3-month Libor Plus 0.28% Due March 2017 [Member]
Debt Instrument [Line Items]
Maturity Date	Mar. 03, 2017
Notes	1,000	[1]	0
Effective Rate	0.56%		0.00%
Debt Instrument, Basis Spread on Variable Rate	0.28%
Floating rate notes 3-month Libor plus 0.5% due March 2019 [Member]
Debt Instrument [Line Items]
Maturity Date	Mar. 01, 2019
Notes	500	[1]	0
Effective Rate	0.78%		0.00%
Debt Instrument, Basis Spread on Variable Rate	0.50%
Fixed-Rate Notes, 1.625%, Due March 2014
Debt Instrument [Line Items]
Maturity Date			Mar. 14, 2014
Notes	0		2,000
Debt Instrument, Interest Rate, Stated Percentage			1.625%
Effective Rate	0.00%		0.64%
Fixed-Rate Notes, 2.90%, Due November 2014
Debt Instrument [Line Items]
Maturity Date	Nov. 17, 2014		Nov. 17, 2014
Notes	500		500
Debt Instrument, Interest Rate, Stated Percentage	2.90%		2.90%
Effective Rate	3.11%		3.11%
Fixed-Rate Notes, 5.5%, Due February 2016
Debt Instrument [Line Items]
Maturity Date	Feb. 22, 2016		Feb. 22, 2016
Notes	3,000		3,000
Debt Instrument, Interest Rate, Stated Percentage	5.50%		5.50%
Effective Rate	3.04%		3.07%
Fixed-Rate Notes, 1.1%, Due March 2017
Debt Instrument [Line Items]
Maturity Date	Mar. 03, 2017
Notes	2,400	[1]	0
Debt Instrument, Interest Rate, Stated Percentage	1.10%
Effective Rate	0.56%		0.00%
Fixed-Rate Notes, 3.15%, Due March 2017
Debt Instrument [Line Items]
Maturity Date	Mar. 14, 2017		Mar. 14, 2017
Notes	750		750
Debt Instrument, Interest Rate, Stated Percentage	3.15%		3.15%
Effective Rate	0.79%		0.84%
Fixed-Rate Notes, 4.95%, Due February 2019
Debt Instrument [Line Items]
Maturity Date	Feb. 15, 2019		Feb. 15, 2019
Notes	2,000		2,000
Debt Instrument, Interest Rate, Stated Percentage	4.95%		4.95%
Effective Rate	4.69%		4.70%
Fixed-Rate Notes, 2.125%, Due March 2019
Debt Instrument [Line Items]
Maturity Date	Mar. 01, 2019
Notes	1,750	[1]	0
Debt Instrument, Interest Rate, Stated Percentage	2.125%
Effective Rate	0.77%		0.00%
Fixed-Rate Notes, 4.45%, Due January 2020
Debt Instrument [Line Items]
Maturity Date	Jan. 15, 2020		Jan. 15, 2020
Notes	2,500		2,500
Debt Instrument, Interest Rate, Stated Percentage	4.45%		4.45%
Effective Rate	2.98%		4.15%
Fixed-Rate Notes, 2.90%, Due March 2021
Debt Instrument [Line Items]
Maturity Date	Mar. 04, 2021
Notes	500	[1]	0
Debt Instrument, Interest Rate, Stated Percentage	2.90%
Effective Rate	0.93%		0.00%
Fixed-Rate Notes,3.625%, Due March 2024
Debt Instrument [Line Items]
Maturity Date	Mar. 04, 2024
Notes	1,000	[1]	0
Debt Instrument, Interest Rate, Stated Percentage	3.625%
Effective Rate	1.05%		0.00%
Fixed-Rate Notes, 5.9%, Due February 2039
Debt Instrument [Line Items]
Maturity Date	Feb. 15, 2039		Feb. 15, 2039
Notes	2,000		2,000
Debt Instrument, Interest Rate, Stated Percentage	5.90%		5.90%
Effective Rate	6.11%		6.11%
Fixed-Rate Notes, 5.5%, Due January 2040
Debt Instrument [Line Items]
Maturity Date	Jan. 15, 2040		Jan. 15, 2040
Notes	2,000		2,000
Debt Instrument, Interest Rate, Stated Percentage	5.50%		5.50%
Effective Rate	5.67%		5.67%
Other long-term debt
Debt Instrument [Line Items]
Other long-term debt	$ 4		$ 21
Effective Rate	2.39%		1.46%

[1] In March 2014, the Company issued senior notes for an aggregate principal amount of $8.0 billion.